[Intel-gfx] [PATCH 1/3] drm/i915/icl: Handle YCbCr to RGB conversion for BT2020 case

[Uma Shankar]

Currently input csc for YCbCR to RGB conversion handles only
BT601 and Bt709. Extending it to support BT2020 as well.

v2: Fixed the co-efficients for LR to FR conversion,
as suggested by Ville.

v3: Fixed Y Pre-offset in case of Full Range YCbCr as suggested
by Ville.

v4: Split the v2 and v3 changes.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/i915/intel_sprite.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 2913e89..4f513600 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -433,6 +433,18 @@ int intel_plane_check_src_coordinates(struct intel_plane_state *plane_state)
 			0x9EF8, 0x7800, 0xABF8,
 			0x0, 0x7800,  0x7ED8,
 		},
+		/*
+		 * BT.2020 full range YCbCr -> full range RGB
+		 * The matrix required is :
+		 * [1.000, 0.000, 1.474,
+		 *  1.000, -0.1645, -0.5713,
+		 *  1.000, 1.8814, 0.0000]
+		 */
+		[DRM_COLOR_YCBCR_BT2020] = {
+			0x7BC8, 0x7800, 0x0,
+			0x8928, 0x7800, 0xAA88,
+			0x0, 0x7800, 0x7F10,
+		},
 	};
 
 	/* Matrix for Limited Range to Full Range Conversion */
@@ -461,6 +473,18 @@ int intel_plane_check_src_coordinates(struct intel_plane_state *plane_state)
 			0x8888, 0x7918, 0xADA8,
 			0x0, 0x7918,  0x6870,
 		},
+		/*
+		 * BT.2020 Limited range YCbCr -> full range RGB
+		 * The matrix required is :
+		 * [1.164, 0.000, 1.678,
+		 *  1.164, -0.1873, -0.6504,
+		 *  1.164, 2.1417, 0.0000]
+		 */
+		[DRM_COLOR_YCBCR_BT2020] = {
+			0x7D70, 0x7950, 0x0,
+			0x8A68, 0x7950, 0xAC00,
+			0x0, 0x7950, 0x6890,
+		},
 	};
 	const u16 *csc;
 
-- 
1.9.1